Microsoft KB Archive/253502

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Error Message When Attempting to Resolve NetBIOS Name Longer than 16 Characters with VPN or RAS Connection

PSS ID Number: 253502

Article Last Modified on 10/16/2002

The information in this article applies to:

  • Microsoft Windows NT Server 4.0
  • Microsoft Windows NT Workstation 4.0

This article was previously published under Q253502


When you attempt to resolve a NetBIOS server name that is longer than 16 characters (for example, net view \\xxxxxxxxxxxxxxxxx) after you establish a virtual private network (VPN) or Remote Access Service (RAS) connection, the following error message may be displayed:

System error 53 has occurred.

In addition, programs that rely on resolution of NetBIOS server names that are longer than 16 characters may be unable to contact the server and error messages similar to the following examples may be displayed:

Server not found.
Server unavailable.


This behavior occurs because the service responsible for directing the resolution of NetBIOS server names longer than 16 characters was not informed of the creation of the transient registry key that contained the new DNS server's Internet Protocol (IP) address.


A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows NT 4.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English-language version of this fix should have the following file attributes or later:

   Date         Time     Size     File name     Platform
   02/03/2000   01:26p   76,560   Mswsock.dll   I386
   02/03/2000   01:27p   45,328   Rnr20.dll     I386



Microsoft has confirmed that this is a problem in Windows NT 4.0.

Additional query words: name resolution view

Keywords: kbbug kberrmsg kbnetwork kbQFE KB253502
Technology: kbWinNT400search kbWinNTS400 kbWinNTS400search kbWinNTsearch kbWinNTSsearch kbWinNTW400 kbWinNTW400search kbWinNTWsearch